Lesson 13

The purpose of this True or False is to elicit strategies and understandings students have for adding with multiples of 2 and 2 equal addends. These understandings help students deepen their understanding of the properties of operations, fluency within 20, and will be helpful practice as students develop foundations for multiplication.

• Display one statement.
• “Hagan una señal cuando sepan si la afirmación es verdadera o no, y puedan explicar cómo lo saben” // “Give me a signal when you know whether the statement is true and can explain how you know.”
• 1 minute: quiet think time

• Share and record answers and strategy.
• Repeat with each statement.

• “¿Cómo pueden explicar su respuesta sin encontrar el valor de ambos lados?” // “How can you explain your answer without finding the value of both sides?”

The purpose of this activity is for students to have another chance to practice skip-counting by 2, 5, and 10 and addition and subtraction within 1,000.

Gather materials from:

• Write Numbers, Stage 4
• Target Numbers, Stages 6 and 7
• Five in a Row, Stages 7 and 8
• How Close, Stage 4

• “Ahora van a escoger centros de los que ya conocemos” // “Now you will choose from centers we have already learned.”
• Display the center choices in the student book.
• “Piensen qué les gustaría hacer primero” // “Think about what you would like to do first.”
• 30 seconds: quiet think time

• Invite students to work at the center of their choice. 
• 15–20 minutes: center work time
• “Escojan qué les gustaría hacer ahora” // “Choose what you would like to do next.”
• 15–20 minutes: center work time
• If time allows, have students choose a third center to work on.

• Invite 2-3 students to share their favorite method for adding and subtracting within 1,000.